Add Yahoo as a preferred source to see more of our stories on Google. The entrance to the cave looks sterilized — a stainless steel door that wouldn’t seem out of place in a hospital looks wholly ...

Discover the jaw-dropping historical icon that is the underground wonderland of Mammoth Cave National Park in Kentucky.

Venture beyond Mammoth Cave National Park's main tours to uncover secluded natural wonders, unique landscapes, and lesser-known spots in this Kentucky park.

Mammoth Cave National Park protects the world’s longest known cave system, a sprawling underground world with more than 426 miles of discovered passages. The park’s size, history, and unique geology ...

Mammoth Cave may not be one of the seven wonders of the world, but the national park is one of the wonders of the Bluegrass State. It's "the world's longest known cave system, with more than 400 miles ...

Hundreds of Christmas carolers in Kentucky plan to break away from their normal door-to-door routine when they head below the surface on the first Sunday in December. Trained singers and novices are ...

The entrance to the cave looks sterilized — a stainless steel door that wouldn’t seem out of place in a hospital looks wholly foreign out here in Mammoth Cave National Park. Yet our cave guide that ...

Boardwalk trail through forest in Mammoth Cave National Park, Kentucky - Zrfphoto/Getty Images Hidden out of sight from the world of daylight, it's inevitable that the chambers of Mammoth Cave exude a ...